Transaction Processing

All point-of-sale (POS) terminals that process PIN-based debit must be encrypted before being used. The encryption process is handled by the processor or an authorized service provider. Thecredit card companies (e.g. American Express and Discover) and Associations (i.e. Visa and MasterCard) have developed mandatory encryption standards, so make sure your processor is compliant.
Each PIN debit transaction begins by swiping the card through a POS device and then the cardholder authenticates him- or herself by entering their PIN (except in some special circumstances). The following requirements apply:

Authorizations. Only transactions that have received an authorization approval should be completed.

Pre-authorizations.Pre-authorization requests must be initiated using a cardholder PIN and for a specified amount. Funds cannot be transferred until a pre-authorization completion response is received for the transaction amount. Completing a pre-authorized transaction does not require the use of PIN or a POS terminal.

Partial pre-authorizations. Merchants initiating pre-authorization requests must support the processing of partial pre-authorizations.

Cardholder identification. The cardholder PIN is normally used for identification, unless both:

Technical problems prevent the cardholder from entering the PIN and

The merchant chooses to use a sales draft to be signed by the cardholder who is also asked to provide identification.

PIN privacy. The merchant is not allowed to ask the cardholder to reveal his or her PIN.

Balance inquiries. A balance inquiry can only be completed at a POS terminal with a PIN.

Credit transactions. A credit transaction can only be initiated if the cardholder provides the sales receipt from the original transaction and must:

Be processed to the same card and within one year of the original transaction date.

Be initiated through the use of a PIN and at a POS terminal.

Be for an amount equal to or less than the original transaction amount.

Be initiated from the same merchant (not necessarily at the same merchant location).

Processing Transaction Reversals
A transaction can be reversed electronically if the reversal is done on the same settlement day as the original transaction. The following requirements apply:

A reversal must be initiated at the same merchant location where the original transaction was processed.

The card must be read by a POS terminal.

The cardholder must re-enter his or her PIN.

The merchant must transmit the trace number and the exact amount of the reversal.

Transaction Receipt
The merchant is required to provide the cardholder with a transaction receipt that includes all of the following information:

Transaction amount.

Transaction date.

Transaction type (e.g., sale, credit, reversal).

Only the last four digits of the account number.

Merchant name and location.

Trace number.

The Takeaway
The fact that the new interchange pricing structure is much more favorable for merchants processing signature-based rather than PIN-based debit transactions does not mean that you should switch to the latter arrangement. Remember that what matters for you is the overall discount your processor charges you. Interchange is only a part of this discount and will remain the same, regardless of whether your customers authenticate themselves through a PIN or a signature.
On a separate note, now that Visa has made it mandatory for all U.S. processors to support acceptance of chip-based transactions by April 1, 2013, it seems likely that in the not-too-distant future all card transactions may become PIN-based. Yes, chip-and-PIN cards are different from their mag-stripe counterparts, but, from a cardholder’s point of view, the use of either type is indistinguishable from the other.

Why hasn’t your processor mentioned the Durbin Amendment?Learn how to lower your card acceptance cost: www.vms-washington.com and ask about the Durbin Amendment that was passed on October 2011 and how it will help you lower your rates.